Accessing typed URL

My website has to two domain names for eg. olddomanin.com and newdomain.com which map to the same physical file(index.html) on my www folder on the Apache server. Is there any function to know how the user accessed the index.html file, i.e via olddomain.com or newdomain.com in his browser.

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: Hi:: : My website has to two domain names for eg. olddomanin.com and newdomain.com which map to the same physical file(index.html) on my www folder on the Apache server. Is there any function to know how the user accessed the index.html file, i.e via olddomain.com or newdomain.com in his browser.

$_SERVER['SERVER_NAME'] if I remember correctly. Just use a foreach to walk through $_SERVER and output all the variables, and it'll be one of the ones listed for sure.